Clamping nut



Dec. 19, 1967 c. I. WILLIAMS 3,358,545

CLAMPING NUT Filed Aug. 18, 1965 m/vfimbfi CHESTER WILLIAMS 7 UnitedStates Patent 3,358,545 CLAMPING NUT Chester I. Williams, 347 GreenbriarSE., Grand Rapids, Mich. 49506 Filed Aug. 18, 1965, Ser. No. 480,689 3Claims. (Cl. 85-32) This invention relates to the construction of nutsthat must be repeatedly unscrewed from the ends of bolts underconditions favoring the accumulation of foreign material on the boltthreads. The preferred form of the invention has been developed as a nutforming a component of a tie system for securing forms preparatory topouring concrete. While the mass of the concrete is poured on theopposite side of the form from the clamping nut, the liquid concrete isoften spilled about in a random fashion during the pouring process.Swinging overhead buckets of liquid concrete will often drip substantialquantities during the passage from the source to the point of deposit,and anything tending to jostle the bucket will aggravate the situation.Some of this material is bound to hit the ends of the securing bolts,and has adaquate time to harden in this position before the clamping nutis normally removed. This is only one source of possible accumulationsof foreign material on the bolt. Rock particles, sand, and practicallyanything imaginable can easily find its way into the grooves formed bythe bolt threads. Unscrewing the nut from a thread system that has beencontaminated in this fashion can easily produce either a jamming actioninterfering with the removal of the nut, or an abrasive action that willprogressively wear away the interengaged threading on the bolt and thenut.

This invention recognizes the inevitability of these conditions, andprovides a conformation for the end of the nut which will serve toremove the accumulations of foreign material from the bolt threads asthe nut is unscrewed. This arrangement makes it unnecessary for the nutto ride over the foreign particles, and thus reduces the amount oftorque necessary to rotate the nut. The formation of the body of the nutis such as to conduct the foreign particles removed from the boltthreads away from the area adjacent to the bolt so that they do notbecome reembedded.

The several features of the invention will be analyzed in further detailthrough discussion of the particular embodiment illustrated in theaccompanying drawing. In the drawing:

FIGURE 1 is a view showing the conventional securing of a form panel asa concrete structure is progressively developed, and showing thesecuring system of which the preferred form of the nut is a component.

FIGURE 2 is an enlarged section of the form tie system shown in FIGURE1.

FIGURE 3 is an end view ofthe nut shown in FIG- URE 2.

FIGURE 4 is a sectional of the plane 4-4 of FIG- URE 3.

FIGURE 5 is a section of the plane 5-5 of FIG- URE 3.

FIGURE 6 is a section of the plane 6-6 of FIG- URE 3.

FIGURE 7 is a section of the plane 7-7 of FIGURE 6.

Referring to FIGURES 1 and 2, the form structure generally indicated at10 is shown in the usual position of installation for progressivelydeveloping a concrete structure 11. During the successive pours ofconcrete, the anchor rods 12 are embedded in each pour to form securingpoints for the attachment of bolts as shown at 13. These traverse theform structure 10, and are secured by wing nuts 14 which usually bearagainst brackets as shown at 15, for adequate transfer of stresses overto the wood 3,358,545 Patented Dec. 19, 1967 structure of the form 10.After the concrete has set, the wing nuts 14 are unscrewed from thebolts'13. The projecting threaded end 16 of the bolt 13 forms aninviting place for the accumulation of small quantities of concreteintended for deposit to the right of the form structure 10, and theremoval of these foreign particles without jamming the threads of thebolt-andnut is the purpose of the present invention. As the nut isunscrewed, these foreign particles tend to accumulate as shown at 17 inFIGURE 2. If not removed, these particles will tend to find their waybetween the bolt and the nut.

The nut 14 is preferably provided with wings 18 and 19 which formdiametrically opposite handles for tightening and loosening the nut. Theinside surface of the nut is threaded as shown in 20, FIGURE 5, and theinner end of the nut 21 forms a bearing'surface normally engaging thebracket 15 for transfer of clamping forces. The opposite end of the bodyportion 22 of the nut is preferably provided with axially-extendingportions as shown at 23 and 24 on opposite sides of the nut for defininga groove 25 for receiving a transverse locking-pin. The conformation iscommonly known as castellated.

The thread system of the bolt and the nut may be single or multiple, andthe number of threads constituting the thread system will determine thenumber of points of emergence of a thread from the outer end of the bodyportion 22. This invention is particularly concerned with theconformation of the surfaces of the body portion at the point ofemergence of the one or more threads. The portion of the nut indicatedat 26 in FIGURE 6 is in part defined by a face intersecting the surfacesforming the thread system of the nut, and is a part of the ridge on thenut extending into the corresponding groove between adjacent ridges ofthe bolt threading. This face extends across the interval between theadjacent thread ridges of the bolt, and forms a cleaning surfaceextending into this space. It is important that this face forms an acuteangle with the crest and root surfaces of the threads such as, forexample, the crests of .the threads indicated at 20 in FIGURE 7. Thisconformation produces the effect of a chisel extending down into thethread grooves of the bolt to progressively remove any foreign particlesencountered as the nut is unscrewed. The rotation corresponding tounscrewing will normally be counterclockwise, as viewed in FIGURES 3 and7. It is preferable that the adjacent portions of the surface definingthe outer end of the body 22 of the nut are generally convex disposed insuch a manner as to facilitate the flow of foreign particles away fromthe threaded area so that they can drop off, rather than becomere-embedded.

The particular embodiments of the present invention which have beenillustrated and discussed herein are for illustrative purposes only andare not to be considered as a limitation upon the scope of the appendedclaims. In these claims, it is my intent to claim the entire inventiondisclosed herein, except as I am limited by the prior art.

I claim:

1. A clamping nut for engaging a projecting threaded end of a bolt of aform-securing system, said nut comprising:

a body portion having a threaded inside surface, and a transversebearing surface at one end of said body portion, the opposite endthereof having at least one portion having a face intersecting saidthreaded surface and extending between adjacent threads to form acleaning surface extending into the space between adjacent threadportions on said bolt, said face forming an acute angle within thematerial of said nut, with the adjacent portion of said threaded insidesurface pointing in the direction of movement of said nut at said facecorresponding to loosening the same,

. 4 7 whereby foreign material is cleared from the thread ReferencesCited end of said bolt as said nut is unscrewed. I UNITED STATES PATENTS2. A nut as defined 1n claun 1, wherein said opposite 22 5 1 7 end has aplurality of peripherally spaced portions pro- O 4/ 880 Ibbotson et a185 32 vided with said faces, each of said portions being an axial1339578 5/1920 9 85-42 extension of said body portion having a groovefor a 1 2 5 3 locking pin.

3. A nut as defined in claim 1, wherein the surfaces ,7 v of said bodyportion adjacent to said face are convex and CARL r Pr'mary Exmmerdisposed to conduct foreign particles away from said bolt 10 R. S.BRITTS, Assistant Examiner. as said nut is unscrewed.

1. A CLAMPING NUT FOR ENGAGING A PROJECTING THREADED END OF A BOLT OF AFORM-SECURING SYSTEM, SAID NUT COMPRISING: A BODY PORTION HAVING ATHREADED INSIDE SURFACE, AND A TRANSVERSE BEARING SURFACE AT ONE END OFSAID BODY PORTION, THE OPPOSITE END THEREOF HAVING AT LEAST ONE PORTIONHAVING A FACE INTERSECTING SAID THREADED SURFACE AND EXTENDING BETWEENADJACENT THREADS TO FORM A CLEANING SURFACE EXTENDING INTO THE SPACEBETWEEN ADJACENT THREAD PORTIONS ON SAID BOLT, SAID FACE FORMING ANACUTE ANGLE WITHIN THE MATERIAL OF SAID NUT, WITH THE ADJACENT PORTIONOF SAID THREADED INSIDE SURFACE POINTING IN THE DIRECTION OF MOVEMENT OFSAID NUT AT SAID FACE CORRESPONDING TO LOOSENING THE SAME, WHEREBYFOREIGN MATERIAL IS CLEARED FROM THE THREAD END OF SAID BOLT AS SAID NUTIS UNSCREWED.